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use strkey::StrKey;
use keypair::KeyPair;
use crypto;
use crypto::DecoratedSignature;
use network::Network;
use memo::Memo;
use operation::Operation;
use time_bounds::TimeBounds;
use error::Result;
use xdr::ToXdr;


pub type Fee = u32;

pub struct Transaction {
    source: StrKey,
    fee: Fee,
    memo: Memo,
    sequence: u64,
    time_bounds: Option<TimeBounds>,
    operations: Vec<Operation>,
}


pub struct TransactionEnvelope {
    transaction: Transaction,
    payload: TransactionSignaturePayload,
    signatures: Vec<DecoratedSignature>,
}

pub struct TransactionSignaturePayload {
    network: Network,
    transaction: TaggedTransactionBuffer,
}

#[derive(Clone)]
pub enum EnvelopeType {
    // Scp = 1,
    Tx = 2, // Auth = 3,
}

pub struct TaggedTransactionBuffer {
    tag: EnvelopeType,
    buf: Vec<u8>,
}


impl Transaction {
    pub fn new(source: StrKey,
               fee: Fee,
               memo: Memo,
               sequence: u64,
               time_bounds: Option<TimeBounds>,
               operations: Vec<Operation>)
               -> Transaction {
        Transaction {
            source: source,
            fee: fee,
            memo: memo,
            sequence: sequence,
            time_bounds: time_bounds,
            operations: operations,
        }
    }

    pub fn source(&self) -> &StrKey {
        &self.source
    }

    pub fn fee(&self) -> &Fee {
        &self.fee
    }

    pub fn memo(&self) -> &Memo {
        &self.memo
    }

    pub fn seqnum(&self) -> u64 {
        self.sequence
    }

    pub fn time_bounds(&self) -> &Option<TimeBounds> {
        &self.time_bounds
    }

    pub fn operations(&self) -> &Vec<Operation> {
        &self.operations
    }

    pub fn sign(self, key: &KeyPair) -> Result<TransactionEnvelope> {
        let network = Network::public_network();
        self.sign_with_network(&key, network)
    }

    pub fn sign_with_network(self, key: &KeyPair, network: Network) -> Result<TransactionEnvelope> {
        let mut signed_tx = TransactionEnvelope::new(self, network)?;
        signed_tx.sign(&key)?;
        Ok(signed_tx)
    }
}

impl TransactionEnvelope {
    pub fn new(tx: Transaction, network: Network) -> Result<TransactionEnvelope> {
        let payload = TransactionSignaturePayload::new(&tx, network)?;
        Ok(TransactionEnvelope {
            transaction: tx,
            payload: payload,
            signatures: Vec::new(),
        })
    }

    pub fn transaction(&self) -> &Transaction {
        &self.transaction
    }

    pub fn signatures(&self) -> &Vec<DecoratedSignature> {
        &self.signatures
    }

    pub fn sign(&mut self, keypair: &KeyPair) -> Result<()> {
        let message = self.payload.hash()?;
        let signature = keypair.sign_decorated(&message)?;
        self.signatures.push(signature);
        Ok(())
    }
}

impl TransactionSignaturePayload {
    pub fn new(tx: &Transaction, network: Network) -> Result<Self> {
        Ok(TransactionSignaturePayload {
            network: network,
            transaction: TaggedTransactionBuffer::new(&tx)?,
        })
    }

    pub fn signature_base(&self) -> Result<Vec<u8>> {
        let mut buf = self.network.network_id();
        self.transaction.to_writer(&mut buf)?;
        Ok(buf)
    }

    pub fn hash(&self) -> Result<Vec<u8>> {
        let buf = self.signature_base()?;
        Ok(crypto::hash(&buf))
    }
}

impl TaggedTransactionBuffer {
    pub fn new(tx: &Transaction) -> Result<TaggedTransactionBuffer> {
        let buf = tx.to_xdr()?;
        Ok(TaggedTransactionBuffer {
            tag: EnvelopeType::Tx,
            buf: buf,
        })
    }

    pub fn tag(&self) -> &EnvelopeType {
        &self.tag
    }

    pub fn transaction_buffer(&self) -> &Vec<u8> {
        &self.buf
    }
}


#[cfg(test)]
mod tests {
    use TransactionBuilder;
    use Account;
    use super::TransactionSignaturePayload;
    use Network;

    #[test]
    fn test_payload_hash() {
        let mut account =
            Account::from_account_id("GCLDNMHZTEY6PUYQBYOVERBBZ2W3RLMYOSZWHAMY5R4YW2N6MM4LFA72",
                                     999)
                .unwrap();

        let tx = TransactionBuilder::new(&mut account).build().unwrap();
        let payload = TransactionSignaturePayload::new(&tx, Network::test_network()).unwrap();
        let hash = payload.hash().unwrap();
        let expected_hash = vec![0xe3, 0x15, 0x4f, 0x21, 0x29, 0x7a, 0x7a, 0x18, 0x77, 0x99, 0xc5,
                                 0x9b, 0x44, 0x5b, 0xb7, 0xfc, 0x28, 0x10, 0x80, 0xfd, 0xa, 0x37,
                                 0xcb, 0x10, 0x44, 0x73, 0x65, 0x56, 0x3f, 0x29, 0x45, 0xe9];
        assert_eq!(hash, expected_hash);
    }
}